Vigithermes are small thermostats with fixed settings. They provide protection against overheating or temperature control to the nearest degree.
In the vigitherme, the thermostatic element is a bimetallic blade in the form of a spherical cap which has the property of turning over suddenly at a fixed and precise temperature.
The operation of the device at this temperature, determined at the design stage of the vigitherm, remains unchanged.
It is therefore a snap-action thermostat which cannot be adjusted (insensitive to shocks, accelerations and vibrations).